EN 1.4557 (GX2CrNiMoCuN20-18-6) Cast Stainless Steel
EN 1.4557 stainless steel is an austenitic stainless steel formulated for casting. Cited properties are appropriate for the solution annealed (AT) condition. 1.4557 is the EN numeric designation for this material. GX2CrNiMoCuN20-18-6 is the EN chemical designation.
It has a moderately high ductility and a moderately high tensile strength among cast austenitic stainless steels.
The graph bars on the material properties cards below compare EN 1.4557 stainless steel to: cast austenitic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
160
Elastic (Young's, Tensile) Modulus
200 GPa 30 x 106 psi
Elongation at Break
40 %
Fatigue Strength
260 MPa 37 x 103 psi
Impact Strength: V-Notched Charpy
56 J 41 ft-lb
Poisson's Ratio
0.28
Shear Modulus
80 GPa 12 x 106 psi
Tensile Strength: Ultimate (UTS)
560 MPa 81 x 103 psi
Tensile Strength: Yield (Proof)
300 MPa 43 x 103 psi
Thermal Properties
Latent Heat of Fusion
300 J/g
Maximum Temperature: Corrosion
420 °C 800 °F
Maximum Temperature: Mechanical
1090 °C 2000 °F
Melting Completion (Liquidus)
1460 °C 2670 °F
Melting Onset (Solidus)
1420 °C 2580 °F
Specific Heat Capacity
460 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
15 W/m-K 8.7 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
29 % relative
Density
8.0 g/cm3 500 lb/ft3
Embodied Carbon
5.6 kg CO2/kg material
Embodied Energy
76 MJ/kg 33 x 103 BTU/lb
Embodied Water
190 L/kg 23 gal/lb
Common Calculations
PREN (Pitting Resistance)
45
Resilience: Ultimate (Unit Rupture Work)
190 MJ/m3
Resilience: Unit (Modulus of Resilience)
210 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
19 points
Strength to Weight: Bending
19 points
Thermal Diffusivity
4.0 mm2/s
Thermal Shock Resistance
12 points
Alloy Composition
Among cast stainless steels, the composition of EN 1.4557 stainless steel is notable for containing a comparatively high amount of molybdenum (Mo) and including copper (Cu). Molybdenum is used to facilitate tempering. In addition, it offers modest bonuses to a wide range of material properties. Copper is primarily used to improve resistance to acids.
| Fe | 49.5 to 56.3 | |
| Cr | 19.5 to 20.5 | |
| Ni | 17.5 to 19.5 | |
| Mo | 6.0 to 7.0 | |
| Cu | 0.5 to 1.0 | |
| Mn | 0 to 1.2 | |
| Si | 0 to 1.0 | |
| N | 0.18 to 0.24 | |
| P | 0 to 0.030 | |
| C | 0 to 0.020 | |
| S | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ISO 11972: Corrosion-resistant cast steels for general applications
EN 10283: Corrosion resistant steel castings
Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016
Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984
Corrosion of Stainless Steels, A. John Sedriks, 1996
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010